[1] Charite, Dept Med, Berlin, Germany
[2] Washington Univ, Dept Pediat, St Louis, MO 63130 USA
[3] Univ Verona, Dept Pediat, I-37100 Verona, Italy
[4] Univ Oslo, Dept Pediat, Oslo, Norway
[5] Univ Childrens Hosp Geneva, Geneva, Switzerland
[6] Univ Childrens Hosp Vienna, Vienna, Austria
[7] Med Univ Vienna, Dept Paediat & Adolescent Med, Vienna, Austria
[8] Univ Aberdeen, Dept Child Hlth, Aberdeen, Scotland
[9] Univ Virginia, Dept Pediat, Charlottesville, VA USA
[10] Univ Colorado, Sch Med, Dept Pediat, Natl Jewish Med & Res Ctr, Denver, CO USA
[11] Allergy Res Ctr, Goudi, Greece
[12] Charles Univ Prague, Univ Hosp Motol, Dept Pediat, Prague, Czech Republic
[13] Univ Manitoba, Dept Pediat & Child Hlth, Winnipeg, MB R3T 2N2, Canada
[14] Turku Allergy Ctr, Turku, Finland
[15] Univ Childrens Hosp, Dept Resp Med, Zurich, Switzerland